I have found that very late in the game I cannot encounter aliens. I think this may have to do with the following:

1. I have learned all the technologies.2. I have learned all the words that they speak.3. All the above.

What happens when I try? The HUD changes as if I am encountering alien life, but the dialogue box and alien picture does not show. After that I cannot take off or drill, and the only options are to check my ship, or go to game menu to give up, quit, or resume game. I have to quit and then resume game in order to pick up where I left off.

The frustrating thing is that I cannot achieve "encounter all alien races", and I cannot get anymore Omega from alien races. Btw I have finished 3 types of endings so far and love this game. Please fix this bug.